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  1. What Are the First Signs of Flu? - Verywell Health

  2. What Are the Early Flu Symptoms? - Healthline

  3. Signs and Symptoms of Flu | Influenza (Flu) | CDC

  4. Flu Symptoms in Adults: 8 Symptoms to Watch for - GoodRx

  5. First Signs of the Flu: What to Do If You Get Sick - Healthline

  6. Flu Symptoms: Common Signs, Treatments, and Complications - WebMD

  7. Influenza (flu) - Symptoms and causes - Mayo Clinic

  8. Flu (Influenza): Causes, Symptoms, Types & Treatment - Cleveland Clinic

  9. Clinical Signs and Symptoms of Influenza | Influenza (Flu) | CDC

  10. Early flu symptoms in adults and children - Medical News Today